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Significant Accounting Policies and US GAAP (Tables)
6 Months Ended
Jun. 30, 2012
Significant Accounting Policies and U.S. GAAP [Abstract]  
Subsidiaries and percentage ownership in subsidiaries
The consolidated interim financial statements of Vista consolidate the accounts of entities in which we have a controlling financial interest.  All intercompany balances and transactions have been eliminated in the consolidated financial statements.  Our subsidiaries and percentage ownership in these entities are:

   
Ownership
 
Vista Gold U.S., Inc. and its subsidiary
  100%
Vista California, LLC
  100%
Granges Inc.
  100%
Desarrollos Zapal Holding Corp. and its subsidiaries
  100%
Desarrollos Zapal S.A. de C.V. (1% owned by Granges Inc.) and its subsidiaries (a)
  99%
Servicios Administrativos MPA S.A. de C.V. (1% owned by Granges Inc.)
  99%
Servicios Industriales MPA S.A. de C.V. (1% owned by Granges Inc.)
  99%
Vista Gold (Barbados) Corp. and its wholly-owned subsidiary
  100%
Salu Siwa Pty. Ltd and its subsidiary
  100%
PT Masmindo Dwi Area (1% owned by Vista Gold (Barbados) Corp.)
  99%
Vista Minerals (Barbados) Corp. and its wholly-owned subsidiary
  100%
Vista Gold Australia Pty Ltd.
  100%
Minera Gold Stake Holdings Corp. (name changed from Vitliq Holdings Corp. effective
     January 23, 2012)
  100%
Minera Gold Stake S.A. de C.V. (name changed from Vitliq S.A. de C.V. effective January 23, 2012) (1% owned by Granges Inc.)
  99%


(a)
On February 7, 2012, we entered into an earn-in right agreement (the "Earn-in Right Agreement") with Invecture Group, S.A de C.V. ("Invecture") whereby Invecture has the right, exercisable by February 7, 2014 (subject to extension) (the "Earn-in Right Period"), to earn a 62.5% interest in the Concordia gold project, which is owned through our wholly-owned, Mexican subsidiary, Desasarrollos Zapal, S.A. de C.V.  ("DZ Mexico").  During the Earn-in Right Period and subject to the terms of the Earn-in Right Agreement, Vista holds 37.5% of the DZ Mexico shareholder voting rights.  The remaining 62.5% of the DZ Mexico shareholder voting rights are held in a trust that is instructed by representatives of Vista and Invecture.  Upon Invecture's exercise of the earn-in right, Vista will continue to hold a 37.5% interest in DZ Mexico and the Concordia gold project.  See Note 5 for further discussion.